Machine for setting adhesive in door casing joints



May 24, 1960 MACHINE FOR Filed Sept. 8, 1958 M. AMUNDSON ET AL 2Sheets-Sheet 1 g I IO ./2

19- so i 53 INVENTORS NORA/v AMuIvoso/v PAUL AZAD/AN BY QZQ/arW ATTORNEY May 24, 1960 MACHINE FOR Filed Sept. 8, 1958 M. AMUNDSON ETAL2,938,097 ssmwc ADHESIVE IN DOOR CASING JOINTS 2 Sheets-Sheet 2INVENTOR. Mama/v A MUNDSON A UL AzA D/A N 3. BY wry ATTORNEY UnitedStates Patent MACHINE FOR SETTING ADHESIVE IN DOOR CASING JOINTS MoranAmundson, Belmont, and Paul Azadian, San Francisco, Califl, assignors toCurleys Cabinet Shop, a partnership Filed Sept. s, 1958, Ser. No.759,700

Claims. (Cl. 219-1053 This invention relates to a door casing machine.

The object of this invention is to provide a machine for settingthermosetting adhesive, that is, adhesive requiring heat after itsapplication for its setting in the joints in said casing, by applyingheat generated by radio frequency waves in said adhesive.

Another object of this invention is to provide a heat applicator whichin addition exerts considerable pressure on the joint in a door casingduring the application of heat to the same, so that the adhesive settingoperation is done under considerable pressure on said joint. Anotherobject of this invention is to provide a device of the type describedwhich is easy and convenient to operate, and which is simple inconstruction and etficient for the purpose intended.

Another object of this invention is to provide a device of the typedescribed which is cheap to make and inexpensive to maintain.

Other objects and advantages will appear as the specification proceedsand the novel features of the device will be particularly pointed out inthe claims hereto annexed.

In this specification and the annexed drawings, the invention isillustrated in the form considered to be the best, but it is understood,that the invention is not limited to such form; and it is also to beunderstood that in and by the claims following the description, it isdesired to cover the invention in whatsoever form it may be embodied.

This invention is illustrated in accompanying drawings forming a part ofthis specification in which:

Fig. 1 is a plan view of the device.

Fig. 2 is a side view of the same, some parts being broken away to showthe inner parts thereof.

Fig. 3 is an enlarged side view of the applicator shown as applied to adecreasing.

Fig. 4 is a front view of Fig. 3, and

Fig. 5 is a plan view of a door casing.

In detail, our machine includes a table 1 having a top 2 and supportedby suitable legs 3. The table 1 supports a radio frequency generator 5,which may be of any type capable of producing enough energy for thepurpose as hereinafter shall be described in detail. A tuner 8 isconnected with said generator 5 by wires 9 and 10, which tuner is usedto regulate the impedance of the radio frequency generator to correspondwith the load involved in the operation.

The table 1 also carries a pressure and heat applicator 15. The latteris secured to the free end of a lever 16, the other end of which isfulcrumed to a pair of standards 17 with freedom of swinging. A longshaft 19 pierces said lever, the top 2 of said table and connected to afoot pedal 20, one end of which is fulcrumed to the table legs 3 and theother free end 21 extends beyond the front of said table. A coil spring23 is interposed around the shaft 19 between the lever 16 and the top 2of the table 1, which spring urges said lever upwardly and away fromsaid table top. Another coil spring 25 connects said foot pedal with atable shelf 26 provided under the top 2, which spring pulls said pedalupwardly.

The pressure and heat applicator 15 consists of an electrode 30 which ispreferably made of copper or aluminum in form of a comparatively longbar 31, having a flange 32, located in the middle of the top of said barand extending longitudinally over the central portion thereof.

The electrode 30 is secured to a triangular plates 34 secured to the ofbolts 33. The latter The angles 40 are securely attached to the lowersurface of the lever 16 at its free end. The pivot 36 may swing betweensaid plates in a plane transverse to the electrode 30. Hence, saidelectrode may swing forward and backward about the bolt 35 and to theright and to the left about the bolt 41. i

The electrode 30 is connected by a wire 43 secured thereto by a screw 44to the tuner 8. Directly under said electrode 30 is another metallicelectrode 48 in form of a plate located in the top of the table 1 andcovered by a sheet 49 of special adhesive 'repellant plastic. by a wire50.

A push-button switch 53 connected to the frequency generator 5 by wires54 and 55 is provided in the front of the table. The switch is securedto 'a stand 57 attached to the shelf 20, and operated by a lever 60 thelower end of which is hinged to said shelf in close proximity to saidstand 57.

' An operator by pressing moves the heat applicator shaft 19 and thelever may deem desirable he the foot pedal 20 downwardly 15 downwardlythrough the 16. At any time as the operator may press by the knee thelever 60, and thereby put the frequency generator'into operation. Thus,this machine may simultaneously apply pressure and heat on the joiningportions of planks forming a door casing.

Figure 5 shows a corner of said casing consisting of two planks 65 and66 joined at the right angle to each other, the visible line 67 ofjunction being at the 45 to the outer sides of said planks. The frontside of the planks 65 and 66 is bevelled from the outer side thereoftoward the inner side, as shown in Figures 3 and 4.

The planks are joined by a joint 68 denoted by said line 67, a dottedline 69 denoting the continuation of the inner side 70 of the plank 66,and the outer side of the plank 65. This joint is made by cutting apiece off the top of the plank 66 parallel to the bottom leaving abottom piece 71 and a corresponding piece of the bottom portion of theplank 65 leaving a top piece 72 and placing the latter piece over thepiece 71. A layer of thermosetting adhesive is placed between the pieces71 and 72 before the same are joined.

In order to assemble said planks at the right angle correctly, abutments75 and 76 are provided on the table in front of said electrode 48. Whenthe planks 65 and 66 are placed against said abutments they form theright angle and their joint 68 is between the electrodes 30 and 48.

The device operates as follows: the ends of the planks 65 and 66 arefashioned to make the joint 68, and

The electrode 48 is connected to the tuner 8 3 theme-setting adhesive isapplied to both surfaces of the joint. The planks 65 and 66 are placedagainst their respective abutments 75 and 76 so that their ends meet.The applicator 15 is-brought down and placed carefully on the joint asshown in Figs. 3 and 4. The applicator 15 will take an angular positionin respect to the top 2 of the table 1, due to the position of theplanks in relation to the applicator and also because the incline of thefront side of the plank forwardly.

After the applicator 15 has been properly set on the joint 68, theoperator presses with his foot the foot lever 20 and thereupon pusheswith his knee the lever 60, thus turning the switch 53 on and sendingthe radio frequencies through the electrodes 30 and 48 and the joint 68.The tuner 8 permits the operator to select the proper impedance so thata proper amount of heat is applied to the joint. The adhesive setswithin a few seconds.

This machine is simple in operation, cheap to make and very efficient,reducing the cost of labor to a small fraction of the manual operation.

In "some cases the joint 68 may be on the right side of the line 67, inwhich case the applicator 15 is swung to the right from its neutralposition and over said joint 68. This is made possible by thearrangement of the electrode 30 for swinging in two transversedirections as has been explained in detail heretofore.

We claim:

l. A machine for setting the adhesive in the joint of a door casing,comprising a table, a radio frequency generator, a tuner electricallyconnected to said generator, a stationary electrode supported by saidtable, a movable electrode above said stationary electrode, bothelectrodes being electrically connected to the tuner, a lever swingablysecured to said table, means secured to the free end of said lever forswingably carrying said movable electrode, means on said table forcentering said casing for placing the joint between said electrodes,means operatively connected with said lever for forcing the same and themovable electrode depending therefrom downwardly for applying force onsaid joint, said radio frequency generator, tuner and electrodes beingadapted to produce heat in the adhesive in said joint and to set thesame, while the pressure is applied on said joint.

2. A machine for setting the adhesive in the joint of a door casing,comprising a table, a radio frequency generator, a tuner electricallyconnected to said generator, a stationary electrode supported by saidtable, a movable electrode above said stationary electrode, bothelectrodes being electrically connected to the tuner, a lever swingablysecured to said table, a pivot depending from the free end of said leverand secured thereto with freedom of swinging, said movable electrodebeing operatively connected to said pivot with freedom of swinging intransverse direction to the swinging of the pivot, a pair of abutmentson said table for placing the sides of the door casing at the rightangle to each other and for centering the joint therebetween under saidmovable electrode; means operatively connected with said lever forforcing the same and the movable electrode downwardly for applying forceon said joint, while radio frequency heat is applied on said adhesive bysaid generator through said tuner and electrodes.

3. A machine for setting the adhesive in the joint of a. door casing,comprising a table, a radio frequency generator, a tuner electricallyconnected to said generator, a stationary electrode supported by saidtable, a movable electrode above said stationary electrode, bothelectrodes being electrically connected to the tuner, a lever swingablysecured to said table, a pivot depending from the free end of said leverand secured thereto with freedom of swinging, said movable electrodebeing operatively connected to said pivot with freedom of swinging intransverse direction to the swinging of the pivot, a pair of abutmentson said table for placing the sides of the door casing at the rightangle to each other and for centering the joint therebetween under saidmovable electrode; a foot lever, a shaft connecting the first mentionedlever with the foot lever for forcing the first lever and the movableelectrode downwardly, when the foot lever is operated, for applyingforce on said joint, while radio frequency heat is applied on saidadhesive by said generator through the tuner and electrodes.

4. A device as described in claim 3 and having a switch above said footlever and means for turning said switch on while pressing said footlever.

5. A device as described in claim 3 and having a sheet of adhesiverepelling material covering said stationary electrode.

References Cited in the file of this patent UNIT ED STATES PATENTS2,324,068 Crandell July 13, 1943 2,514,197 Groten et a1. July 4, 1950FOREIGN PATENTS 759,025 Great Britain Oct. 10, 1956

